Mahle Rings Performance Napier Steel 2nd Ring 4.135in x 1.0MM .136in RW Plain Ring Set

This is a Mahle OE Piston Rings set, part number 3021221. It features a steel Napier 2nd ring designed for specific engine applications. The Napier hook design on the second ring helps to scrape oil from the cylinder wall, preventing it from entering the combustion chamber and contributing to better oil control.

These rings are constructed from durable steel, offering good performance and longevity in demanding engine conditions. The 4.135-inch bore size and 1.0mm thickness are critical dimensions for proper sealing and engine health. Proper installation is key to ensuring these rings perform as intended, maintaining compression and controlling oil consumption.